What is the Evidence That Living Cells Existed on Earth

Question

What is the evidence that living cells existed on Earth up to 3.8 billion years ago?
A) microfossils
B) 16S ribosomal RNA
C) Miller and Urey's experiments
D) Martian folded rock formations
E) diatom shells

Accepted Answer

Microfossils, which are preserved remains of ancient organisms, have been found in rocks that are up to 3.8 billion years old, providing evidence that living cells existed on Earth at that time.